Protective tip for concrete vibrators



July 15, 1952 H. E. M CRERY PROTECTIVE TIP FOR CONCRETE VIBRATORS Filed June 13, 1950 /9 Inventor HHPOLD f. MC'CREPY BAN/l fl/VD TRl/S 7' COMP/1N Y 0F DAYTON OHIO AND W WALKER LEW/S JR.

Patented July 15, 1952 UNITED STATES PATENT OFFICE A ,fa oaiss 7 I PROTECTIVE TIP FOR CONCRETE VIBRATORS Harold E. McCrery, deceased, late of Dayton, Ohio, by The Winters National Bank and Trust 00., and W. Walker Lewis, Jr., executors, Dayton,

Ohio, assignors to Master Vibrator Company, Dayton, Ohio, a corporation of Ohio Application June 13, 1950, Serial No. 167 ,854

-i= Claims. 1

.concrete poured between relatively closely spaced forms to define a wall or the like. For more effective action in such close working areas the end of. the tool is frequently fitted with a flanged tip. 111 the use of the tool, however, it is substantially unavoidable that the tip v will strike the forms or the foundation upon which the concrete is being poured. Damage to the tip results' therefrom, as 'wellas scoring, denting and deformation of the forms with resulting imperfectionsin the surface of the finished wall. In an effort to avoid the describedjdisadvantages, it has heretofore been proposedto provide tips having a soft rubber material molded integrally thereon, such tipsbeing substituted for the unprotected tips whentheir use is deemed desirable. The protection thus afforded is, however, relatively costly. A contractor must keep on hand a supply of the expensive molded tips and upon the development of any flaw in the rubber molding, the entire tip must be discarded and replaced. As a further objection the molded rubber tip while offering the desired protctiomreduces the ability of the flangedtip to perform 'its intended function by altering and making less distinct the configurations thereof.

The instant invention obviates the objections above noted, it being the object of the invention to provide a simple, inexpensive protective device which can be installed on and removed from the tool independently of the tip and which doe not alter the shape or function of the tip.

Thus the object of the invention is to simplify the construction as well as the means and mode of operation of protective tips as disclosed herein, whereby such tips may not only be economically manufactured, but will be more efiicient and satisfactory in use, adaptablev to a wide variety of applications, having a minimum number of parts and be unlikely to get out of repair.

A further object of the invention is to provide a simple, inexpensive sleeve which may be easily assembled upon existing vibrators.

A further object of the invention is to simplify the mode of assembly of such protective tips upon the vibrating tool.

A further object of the invention is to provide a yielding flexible tip for such vibrating tools.

A further. object of the invention is to provide anopen ended tip for such tools in which the material being vibrated is received for transmission thereto of increased vibratory effect.

A further object of the'invention is to provide a protective tip of the character described possessing the advantageous'structural features, the

inherent meritorious characteristics and the mode of operation herein mentioned.

With the above primary and other incidental objects'in view as will more fully appear'in the specification, the inventionintended tobe protected by Letters Patent consists of the features of construction, the par'ts'and combinations thereof, and the mode of operation, as, hereinafter described or illustrated in'the accompanying drawings, or their equivalents.

In carrying out the objects of the invention there is proposed a device in the form of a short length sleeve of resilient deformable material which may be cut from ordinary tube stock, said sleeve being open at its one end to be slipped over the tip and upon the outer end of the tool and open at its opposite end for admission of the ma- I terial to be vibrated to the tip, thesleeve extending in surrounding protective relation to the tip and overhanging the end thereof.

Referring to the accompanying drawing, wherein is found the preferred but obviously not neces- :arily the only form of embodiment of theinven- Fig. 1 is a view of a concrete vibratin tool, of the kind to which theinstant invention is applicable, in use; i I

Fig.2 is a view of the tip end of the vibrating tool in side elevation, showing the protective sleeve thereof in longitudinal setcion;

Fig. 3 is an end view of the tip and surrounding sleeve; and

Fig. 4 is a View of the tool with protective sleeve working in'a mass of concrete, showing how the sleeve prevents contact ofthe .tip with the forms.

Like parts are indicated by similar characters of reference throughout the several views. Referring to the drawing, there is illustrated in Fig. 1 one manner of use of agportable' concrete vibrator. As shown, the vibrator I0 is inserted into amass of poured, unset concrete ll confinedin. forms I2. In accordancewith its known construction and mode of operation, the vibrator has an internal eccentric motion, derived through a power supply means l3, compelling a vibratory'motion of the tool within the mass of concrete. In response thereto, there is a settling and compacting of the concrete mixture so that it may harden into a solid wall of like characteristics throughoutlits, mass. f

'As seen in Figs. 2 and 4, the outer end of the vibrator I0 is slightly reduced in diameter, being connected to the main body of the tool by a taper detachment .of [the sleeve.

concrete; The base of the tip l5 isreducedin 5 diameter to'defin'e with the outer end'of the tool I a peripheral groove 16. Forwardly of the base thereof, the tip is formed with integral web-like walls I! and IS in intersecting ninety degree relation to one another, the peripheral '10" edges of the walls describing,approximatelvparaboloidal curves. V

The tip protective device of .thejinventionpon sists of a sleeve l9 made of resiliento formable material, for example rubber or rubber; snbsti l5prise ,but one of several modes of putting the tute. The sleeve I9 is open at bo th ends and is installed by slipping its one end-over thetip l5 and on to the outer reduced end of the,-tool,;.the

sleeve being expanded by such action and grip- .Din the end of thetooljfor alsecureyetdetachable mounting. As installed thesleeve extends ins rrou d e. protec v eiation tot e t p 5. havin a bearing on the approximately parallel portions of the walls 1'! and I8. The length oftlie sleeve is such ,as'to exceedthe combined lengths of the reduced outer endof thetool and of the lip l5. Accordingly,,the outer endof the sleeve lies unsupportedin projecting overhanging relation to the tip l 5.

By reasonof its beingstretched over the tip and .tool end the material of the sleeve tends to contract in the regionof the peripheralgroove l6 todefine therewitha detentfurther resisting Thev inner vend .of

4 that there is thus provided a device of the character described possessing the particular features of advantage before enumerated as desirable, but which obviously is susceptible pr modification in its formfproportions, detail ;construction and arrangement of parts without departing from the principle involved or sacrificing any of its advantages.

While in,order to comply with the statute the invention has been described in language more or less specific as to structural features, it is to be understood that the invention is not limited vto the specific features shown, but that the ;means;andconstruction herein disclosed cominvent ion into eifect.

" Havingthus described the invention, what is claimed 1. A concrete vibrator or like device, including avibratory tool, a flanged tip onsaid tool and an open ended flexible sleevedetachably received on the end of said tool and extending insulirounding protective relation tosaid tip vbeyond the outer end thereof. H

2. A 'concrete vibratoror like device, including a vibratory tool, an agitator tip on the endnof said tool presenting'i intersecting flange edges, and a resilient open ended deformable sleeve received on the end of said tool and, extending in, surrounding protective relation to saidtip beyond the outer end thereof.

3. A concrete vibrator or like device according to claim 2, characterized in that saidjsleeve is supported ,on saidfianged edges .over'the th leevei v e a :S Wn .so that itmay length of said tip butis unsupported beyond-said slidepartly along and .closely hug .tl e,,taper 14 on thetoolfind. Moreover, such beveled edge reduces the resistance to withdrawal of, the tool from the concrete, helping t0 avoid ,the possibility thatthe sleeve will be dislodged "bysuch 40 withdrawal. Both ends of the sleeve may be beveled, as hereillustrated, in which .case it is immaterial which end thereof is slipped onto the too ,A function of the protective sleeve I79 isillus trated in Fig. 4. As there shown, the tool H! has been introduced in the concretell at; such an angle thatthere is a probability of the tip I5 striking and denting the forms .I 2. By-reason of the presence, of the sleeve [9, however, the

jforms as well as theioundation upon ,which the concrete is formed can ,be'contacted only by the relatively ,soft and yieldingmaterialof the sleeve. Inasmuch as the outer end of the sleeve isfopen and unsupported it .is capable of fiexure in'response ,to the vibratory motions of the tool .resultingin a pumping-like action of the concrete to andfromthetip l5.

A feature ,or .the protectivesleeve, of the, in- Y vention is its ease of manufactureand .replacement. Accordin to one. method of manufacture, the sleevesare simply cutoff in .the desired lengths ,from rubber tube stock .of proper diameter. The beveled .ends -are formed. after cutting orthey ,canbe made an integral part .of .the

tube as peripheral grooves, with the cuts being taken throughsuch grooves. .Thesleeves being relatively -.'inexpensiv e, but .quite satisfactory, a contractorcan keepalarge .number of them on hand andif desirable can further obviatethe task Number .of removing and storing, a sleeve after ,use by simply cutting it fromltheytool for discard.

.From the above description it .willbe apparent tip and is deformable in the. operation ,oithe terial to bevibrated to and from the tipwithin the .sleeve. n

4. A concrete vibrator or like device, including a vibratory tool presenting an outer end of reduced diameter, an agitator tip securedto the .outer end of said tool and defining with said outer end a peripheral groove, and a resilient open ended deformable sleeve detachably, .-r,eceived with a press fit on the outer-end of said tool and extending in surroundingprotective relation to said tip, said sleeve contracting radiallyin the region of said peripheral groove to define with said groove detenting means ,restraining inadvertent removal of the sleeve, and said sleeve further extending beyond said tipfor fiexure of the unsupported end thereofan'dio preclude contact of the endof said tip .with the work while admitting vibrated material to the tip.

, THE WINTERS NATIONAL BANK & TRUST COMPANY,

.By KG. SMITH,

v Trust Ofi'icer,

W. WALKER LEWIS, JR., Erecutors of the Estate of Harold E..McCrez 'z Deceased.

REFERENCES CITED The following references are of record, in the 'file of this patent:

UNITED STATES PATENTS Name Date 1,988,316 Jackson ,Jan. 15, 1935 2,080,727 Ludeman -May 18, '1937 2,492,431 Kroeckel ,Dec. 27,.l949 

